
package org.apache.osgimaker.analyse.algorithm.dependency;

import java.io.File;
import java.io.IOException;

import org.apache.osgimaker.analyse.algorithm.CommandLine;
import org.apache.osgimaker.analyse.algorithm.util.Text;



public class DependencyCheckerCommandLine extends CommandLine
{
  private static final String DEPENDENCIES = "-dependencies=",
                              RENDERER = "-renderer=";
  
  private String _dependencyDefinition;
  private ResultRenderer _renderer;
  
  public DependencyCheckerCommandLine(String[] args)
  {
    super(args);
  }

  protected void handleOption(String argument)
  {
    if (argument.startsWith(DEPENDENCIES)) 
    {
      handleDependenciesOption(argument.substring(DEPENDENCIES.length()));
    } else if (argument.startsWith(RENDERER)) {
      handleRenderer(argument.substring(RENDERER.length()));
    } else {
      super.handleOption(argument);
    }
  }

  /** Returns the usage of correct command line arguments and options. */
  public String getUsage() 
  {
    return DEPENDENCIES + "<description>|@<description file> "
         + "[" + RENDERER + "<fully qualified class name of a ResultRenderer>] "
               + super.getUsage();
  }
  
  public String getDependencyDefinition()
  {
    return _dependencyDefinition;
  }
  
  public ResultRenderer getRenderer() 
  {
    return _renderer == null ? new DefaultResultRenderer() : _renderer;
  }
  
  private void handleDependenciesOption(String option)
  {
    if (option.startsWith("@"))
    {
      try
      {
        option = Text.readTextFile(new File(option.substring(1)));
      } catch (IOException e)
      {
        System.err.println("Error in reading dependencies description file: " 
                           + e);
        option = "";
      }
    }
    _dependencyDefinition = option;
    if (_dependencyDefinition.length() == 0) 
    {
      _valid = false;
    }
  }
  
  private void handleRenderer(String className) {
    try
    {
      _renderer = (ResultRenderer) Class.forName(className).newInstance();
    } catch (Exception e)
    {
      System.err.println("Error in creating ResultRenderer " + className 
                         + ": " + e);
      _valid = false;
    }
  }

  public boolean isValid()
  {
    return super.isValid() && _dependencyDefinition != null;
  }
}
